TW202317372A - Polymer film and uses of the same - Google Patents

Abstract

A polymer film and a laminated glass manufactured using the same are provided. The polymer film comprises a first layer, a second layer and a third layer, wherein the third layer is located between the first layer and the second layer, and the two surfaces of the third layer are in contact with the first layer and the second layer, respectively. The surface of the first layer that is not in contact with the third layer is a first surface, and the surface of the second layer that is not in contact with the third layer is a second surface, wherein the first surface has a void volume (Vv) value at a material ratio of 10% ranging from 3 [mu]m3/[mu]m2 to 30 [mu]m3/[mu]m2 and a dale void volume (Vvv) at a material ratio of 80% less than 2 [mu]m3/[mu]m2, and the ratio of the maximum pit height (Sv) of the first surface to the thickness of the first layer is 0.2 or less.

Description

Polymer films and their applications

The present invention relates to a polymer film, in particular to a polymer film having a specific void volume (Vv) value and a valley portion void volume value (dale void volume, Vvv) under a specific load area ratio (material ratio) and A polymer film with a specific ratio of the maximum pit height (Sv) to the thickness of the first layer. The invention also relates to laminated glass produced using the polymer film.

Laminated glass is a kind of glass material with a composite structure formed by sandwiching a polymer film between two glass sheets, and bonding the glass sheet and the polymer film tightly by means of thermocompression. Laminated glass is widely used in the automobile industry and construction industry because of its better impact resistance and sound insulation.

Since the preparation process of laminated glass involves heat-compression bonding between the glass sheet and the polymer film, in order to avoid air remaining between the glass sheet and the polymer film of the laminated glass, it is usually embossed on the surface of the polymer film to form lines (i.e., design a concave-convex structure) so that the air can be discharged smoothly during pre-pressing, thereby avoiding the generation of air bubbles in the laminated glass.

The polymer film of laminated glass can have a multilayer structure to provide laminated glass with desired functions. For example, a laminated glass with sound insulation function can be prepared using a polymer film having two outer layers and an inner sound-insulating layer.

When mechanically embossing a polymer film with a multi-layer film structure, the texture that should only be formed on the surface of the outer layer is often transferred to the surface of the functional layer (such as the sound insulation layer) in the middle of the polymer film. In the subsequent hot-pressing process of laminated glass, the texture on the surface of the functional layer will not be eliminated, resulting in the appearance of visible filamentary stripes in the laminated glass, which will cause visual defects of optical deformation and affect the laminated glass. visibility.

The present invention aims to provide a polymer film, which has a structure of at least three layers, and has a specific void volume (Vv) value and a specific valley portion void volume (Vvv) value under a specific load area ratio, and has a specific The ratio of the maximum trough depth (Sv) value to the thickness of the first layer. After the polymer film of the present invention is thermocompressed with the glass sheet, no air will remain in the laminated glass produced, and there will be no delamination of edge defects, and the laminated glass will not have the problem of optical deformation. Therefore, the polymer film of the present invention is particularly suitable for the preparation of functional sound-insulating laminated glass.

One object of the present invention is to provide a polymer film, which comprises a first layer, a second layer and a third layer, the third layer is located between the first layer and the second layer, and the two surfaces of the third layer are respectively connected to the first layer One layer is in contact with the second layer, the surface of the first layer that is not in contact with the third layer is the first surface, and the surface of the second layer that is not in contact with the third layer is the second surface, where the first surface has a load area ratio of The void volume (Vv) value at 10% is 3 cubic micrometers/square micrometer (μm ³ /μm ² ) to 30 cubic micrometers/square micrometer, and the void volume (Vvv) of the trough part of the first surface when the loading area ratio is 80% ) value is less than 2 cubic micrometers per square micrometer, and the ratio of the maximum trough depth (Sv) value of the first surface to the thickness of the first layer is 0.2 or less.

In some embodiments of the present invention, the second surface has a void volume value of 3 cubic microns/square micron to 30 cubic microns/square micron when the loading area ratio is 10%, and the second surface has a void volume value when the loading area ratio is 80%. The void volume of the trough is less than 2 cubic micrometers per square micrometer, and the ratio of the maximum trough depth of the second surface to the thickness of the second layer is 0.2 or less.

In some embodiments of the present invention, the thicknesses of the first layer and the second layer are independently 250 microns to 450 microns.

In some embodiments of the present invention, the thickness of the first layer is the same as that of the second layer.

In some embodiments of the present invention, the third layer has a thickness of 50 microns to 250 microns.

In some embodiments of the present invention, the polymer film comprises polyvinyl acetal (polyvinylacetal), and the polyvinyl acetal can be selected from the following group: poly(vinyl formal) (poly(vinyl formal) ), poly(vinyl acetal), poly(vinyl butyral) (poly(vinyl butyral)), poly(vinyl valeral), poly(vinyl hexral), and combinations thereof. In a preferred embodiment of the present invention, the polyvinyl acetal is poly(vinyl butyral).

In some embodiments of the present invention, the third layer comprises polyvinyl acetal and has a glass transition temperature (glass transition temperature, Tg) of -30°C to 10°C, wherein the polyvinyl acetal has The degree of acetalization is 52-80 mol%, the degree of acetylation is 0.1-20 mol%, and the content of hydroxyl group is 20-28 mol%.

In some embodiments of the present invention, the polymer film has a total thickness of 0.1 mm to 2.5 mm.

Another object of the present invention is to provide a laminated glass, which includes a first glass sheet, a second glass sheet, and an intermediate film between the first glass sheet and the second glass sheet, the intermediate film is made of such as Provided by the polymer film described above.

In order to make the above-mentioned purpose, technical features and advantages of the present invention more comprehensible, the following is a detailed description of some specific implementations.

Part of the specific implementations according to the present invention will be described in detail below; however, the present invention can still be practiced in many different forms, and the protection scope of the present invention should not be limited to the specific implementations.

Unless otherwise stated, the terms "a", "the" and similar terms used in this specification and claims should be understood as including singular and plural forms.

Unless otherwise stated, the terms "first", "second" and similar terms used in this specification and the patent application are only used to distinguish the described elements or components, have no special meaning in themselves, and are not intended to be used Yu represents the order of precedence.

Unless otherwise stated, in this specification and the patent application, the term "load area ratio" is defined in accordance with ISO 25178-2:2012. The load area curve is a function curve of the surface height to the area covered by it, and the load area ratio refers to the area above a specified height.

Unless otherwise stated, in this specification and claims, the term "void volume (Vv)" is defined according to ISO 25178-2:2012. Void volume (Vv) refers to the volume of voids per unit area under a specific load area ratio.

Unless otherwise stated, in this specification and the claims, the term "valley void volume (Vvv)" is defined according to ISO 25178-2:2012. Valley Void Volume (Vvv) refers to the volume of the valley space at a specific load area rate.

Unless otherwise stated, in this specification and the patent application, the term "maximum trough depth (Sv)" is defined according to ISO 25178-2:2012. Maximum trough depth (Sv) means the maximum value of trough depth in the reference area.

Unless otherwise stated, in this specification and claims, the term "core void volume (Vvc)" is defined according to ISO 25178-2:2012. Core Void Volume (Vvc) is the volume of core space at a specific load area ratio.

The effect of the present invention compared to the prior art is to provide a multilayer polymer film of at least three layers, which has a specific Vv value and a specific Vvv value under a specific load area ratio, and has a specific Sv value vs. the thickness of the first layer ratio. The polymer film can be used to provide a laminated glass free from bubble defects, edge debonding and optical distortion problems, which is particularly suitable as an acoustic laminated glass. A detailed description of the polymer film of the present invention and its related applications is provided below.

1. polymer film

1.1. Composition of polymer film

The polymer film system of the present invention comprises the first layer, the second layer and the third layer, or the polymer film system of the present invention consists essentially of the first layer, the second layer and the third layer, or the polymer film system of the present invention consists of The first layer, the second layer and the third layer are composed, wherein the third layer is located between the first layer and the second layer, and the two surfaces of the third layer are in contact with the first layer and the second layer respectively. The first layer, the second layer and the third layer each independently contain polyvinyl acetal as an essential component, and the first layer, the second layer and the third layer can each independently further contain other optional components such as a plasticizer as necessary or other known additives. In some embodiments of the present invention, the first layer, the second layer, and the third layer each independently comprise polyvinyl acetal and a plasticizer, or the first layer, the second layer, and the third layer each independently substantially It is composed of polyvinyl acetal and a plasticizer, or the first layer, the second layer and the third layer are independently composed of polyvinyl acetal and a plasticizer.

The first layer, the second layer and the third layer can independently have a single-layer structure or a multi-layer stacked structure. For example, the third layer can be a functional layer, which can be composed of one or more films, and can provide one or more functions, including sound insulation function, heat insulation function, reflection function, anti-reflection function, refraction function, anti- Refraction function, spectroscopic function, and dimming function. In some embodiments of the present invention, the third layer is a sound-insulating layer with a single-layer structure.

1.1.1. polyvinyl acetal

Examples of polyvinyl acetals useful in the polymer films of the present invention include, but are not limited to, poly(vinyl formal), poly(vinyl acetal), poly(vinyl butyral), poly(vinyl acetal), valeraldehyde), and poly(vinyl hexanal). Each of the aforementioned polyvinyl acetals may be used alone or in combination of two or more types. In a preferred embodiment of the present invention, the polyvinyl acetal is poly(vinyl butyral). In the attached examples, the polymer film is composed of poly(vinyl butyral) and plasticizer.

The properties of the polyvinyl acetal that can be used in the polymer film of the present invention are not particularly limited, and polyvinyl acetal with suitable physical properties can be used according to actual needs, so as to facilitate the formation of embossed patterns on the surface of the polymer film. In some embodiments of the present invention, the polyvinyl acetal used in the first layer, the second layer and the third layer of the polymer film has the following physical properties.

The weight average molecular weight (Mw) of the polyvinyl acetal contained in the first layer and the second layer may be independently 230,000 to 280,000, more specifically, 240,000 to 260,000, and the polyvinyl acetal contained in the third layer The weight average molecular weight (Mw) of may be 280,000 to 450,000, more specifically, 320,000 to 420,000, but the present invention is not limited thereto.

In some embodiments of the present invention, the polyvinyl acetal contained in the first layer and the second layer can be respectively independently have an acetal group content (ie, degree of acetalization) of 60 mol% to 85 mol%, for example 60 mol%, 60.5 mol%, 61 mol%, 61.5 mol%, 62 mol%, 62.5 mol%, 63 mol%, 63.5 mol%, 64 mol%, 64.5 mol%, 65 mol%, 65.5 mol%, 66 mol%, 66.5 mol%, 67 mol%, 67.5 mol%, 68 mol%, 68.5 mol%, 69 mol%, 69.5 mol%, 70 mol%, 70.5 mol%, 71 mol%, 71.5 mol%, 72 mol%, 72.5 mol%, 73 mol%, 73.5 mol%, 74 mol%, 74.5 mol%, 75 mol%, 75.5 mol%, 76 mol%, 76.5 mol%, 77 mol%, 77.5 mol%, 78 mol%, 78.5 mol%, 79 mol%, 79.5 mol%, 80 mol%, 80.5 mol%, 81 mol%, 81.5 mol%, 82 mol%, 82.5 mol%, 83 mol%, 83.5 mol%, 84 mol%, 84.5 mol%, or 85 mol%, or the degree of acetalization within the range formed by any two values above. In a preferred embodiment of the present invention, the polyvinyl acetal contained in the first layer and the second layer independently has an acetalization degree of 66 mol% to 75 mol%.

In some embodiments of the present invention, the polyvinyl acetal contained in the third layer may have 52 mole % of polyvinyl acetal based on the total moles of hydroxyl groups, acetal groups, and acetyl groups of polyvinyl acetal. The degree of acetalization to 80 mol%, such as 52 mol%, 53 mol%, 54 mol%, 55 mol%, 56 mol%, 57 mol%, 58 mol%, 59 mol% , 60 mol%, 61 mol%, 62 mol%, 63 mol%, 64 mol%, 65 mol%, 66 mol%, 67 mol%, 68 mol%, 69 mol% , 70 mol%, 71 mol%, 72 mol%, 73 mol%, 74 mol%, 75 mol%, 76 mol%, 77 mol%, 78 mol%, 79 mol% , or 80 mole%, or the degree of acetalization within the range formed by any two values above.

In some embodiments of the present invention, the polyvinyl acetal contained in the first layer and the second layer can be respectively independently have an acetyl content (i.e., degree of acetylation) of 0.1 mol % to 10 mol %, for example 0.1 mol %, 0.15 mol %, 0.2 mol %, 0.25 mol %, 0.3 mol %, 0.35 mol%, 0.4 mol%, 0.45 mol%, 0.5 mol%, 0.55 mol%, 0.6 mol%, 0.65 mol%, 0.7 mol%, 0.75 mol%, 0.8 mol%, 0.85 mol%, 0.9 mol%, 0.95 mol%, 1 mol%, 1.5 mol%, 2 mol%, 2.5 mol%, 3 mol%, 3.5 mol%, 4 mol%, 4.5 mol%, 5 mol%, 5.5 mol%, 6 mol%, 6.5 mol%, 7 mol%, 7.5 mol%, 8 mol%, 8.5 mol%, 9 mol%, 9.5 mole %, or 10 mole %, or the degree of acetylation within the range formed by any two values above. In a preferred embodiment of the present invention, the polyvinyl acetal contained in the first layer and the second layer each independently have an acetylation degree of 0.1 mol% to 5 mol%. If the acetylation of the polyvinyl acetal contained in the first layer and the second layer of the polymer film is lower than the specified range, the polymer film is relatively hard and difficult to form embossed lines. If the acetylation of the polyvinyl acetal contained in the first layer and the second layer of the polymer film is higher than the specified range, the polymer film is relatively soft, and the embossed pattern tends to be too deep.

In some embodiments of the present invention, the polyvinyl acetal contained in the third layer may have 0.1 mole % Acetyl to 20 mol %, for example 0.1 mol %, 0.2 mol %, 0.3 mol %, 0.4 mol %, 0.5 mol %, 0.6 mol %, 0.7 mol %, 0.8 mol % , 0.9 mol%, 1 mol%, 2 mol%, 3 mol%, 4 mol%, 5 mol%, 6 mol%, 7 mol%, 8 mol%, 9 mol% , 10 mol%, 11 mol%, 12 mol%, 13 mol%, 14 mol%, 15 mol%, 16 mol%, 17 mol%, 18 mol%, 19 mol% , or 20 mole%, or the degree of acetylation within the range formed by any two values above.

In some embodiments of the present invention, the polyvinyl acetal contained in the first layer and the second layer can be respectively Independently having a hydroxyl content of 20 mol% to 32 mol%, for example 20 mol%, 20.5 mol%, 21 mol%, 21.5 mol%, 22 mol%, 22.5 mol%, 23 mol% , 23.5 mol%, 24 mol%, 24.5 mol%, 25 mol%, 25.5 mol%, 26 mol%, 26.5 mol%, 27 mol%, 27.5 mol%, 28 mol% , 28.5 mol%, 29 mol%, 29.5 mol%, 30 mol%, 30.5 mol%, 31 mol%, 31.5 mol%, or 32 mol%, or between any two values above The hydroxyl content within the range constituted. In a preferred embodiment of the present invention, the polyvinyl acetal contained in the first layer and the second layer each independently have a hydroxyl content of 25 mol% to 29 mol%. If the hydroxyl content of the polyvinyl acetal contained in the first layer and the second layer of the polymer film is higher than the specified range, the polymer film is relatively hard and difficult to form embossed textures. If the hydroxyl content of the polyvinyl acetal contained in the first layer and the second layer of the polymer film is lower than the specified range, the polymer film is relatively soft and the embossed pattern is likely to be too deep.

In some implementations of the present invention, the polyvinyl acetal contained in the third layer may have 20 mole % of polyvinyl acetal based on the total moles of hydroxyl groups, acetal groups, and acetyl groups of polyvinyl acetal. A hydroxyl content of up to 28 mol %, for example 20 mol %, 20.5 mol %, 21 mol %, 21.5 mol %, 22 mol %, 22.5 mol %, 23 mol %, 23.5 mol %, 24 mol%, 24.5 mol%, 25 mol%, 25.5 mol%, 26 mol%, 26.5 mol%, 27 mol%, 27.5 mol%, or 28 mol%, or between The hydroxyl content within the range formed by any two values above.

1.1.2. Plasticizer

Herein, a plasticizer refers to a chemical substance that can change the plasticity of a thermoplastic resin, and may also be called a plasticizer. Examples of plasticizers include, but are not limited to, esters of polybasic acids or polyhydric alcohols, such as triethylene glycol bis(2-ethylhexanoate) (triethylene glycol bis(2-ethylhexanoate)), tetraethylene glycol bis(2-ethylhexanoate), -ethylhexanoate), triethylene glycol bis(2-ethylbutyrate), tetraethylene glycol bis(2-ethylbutyrate), triethylene glycol diheptanoate, tetraethylene glycol Alcohol Diheptanoate, Dihexyl Adipate, Dioctyl Adipate, Hexyl Cyclohexyl Adipate, Diisononyl Adipate, Heptyl Nonyl Adipate, Dibutyl Sebacate , bis[2-(2-butoxyethoxy)ethyl adipate], polymeric adipate, dipropylene glycol dibenzoate, tripropylene glycol dibenzoate, polypropylene glycol Dibenzoate, Isodecyl Benzoate, 2-Ethylhexyl Benzoate, Propylene Glycol Dibenzoate, Diisononyl Phthalate, Dibutoxyethyl Terephthalate, Castor Sesame oil, methyl ricinoleate, soybean oil, epoxidized soybean oil, and combinations thereof.

The amount of the plasticizer is not particularly limited, as long as the desired plasticizing effect can be provided. Generally speaking, the amount of plasticizer used in the first layer and the second layer of the polymer film can be controlled at 30 to 60 parts by weight based on 100 parts by weight of polyvinyl acetal, such as 30 parts by weight, 31 parts by weight Parts, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, or 60 parts by weight, or within the range formed by any two values above. In a preferred embodiment of the present invention, the amount of plasticizer used in the first layer and the second layer is controlled at 30 to 50 parts by weight based on 100 parts by weight of polyvinyl acetal. The amount of plasticizer used in the third layer of the polymer film can be controlled at 50 to 80 parts by weight based on 100 parts by weight of polyvinyl acetal, such as 50 parts by weight, 51 parts by weight, 52 parts by weight, and 53 parts by weight Parts, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight parts by weight, 79 parts by weight, or 80 parts by weight, or within the range formed by any two values above.

1.1.3. Other conventional additions agent

Conventional additives may include any substance that can be adapted to improve the processability of the polymer film during the manufacturing process, or to impart specific functions to the polymer film. Examples of conventional additives include, but are not limited to, dyes, pigments, stabilizers, antioxidants, flame retardants, infrared absorbers, infrared blocking agents, ultraviolet absorbers, ultraviolet stabilizers, lubricants, dispersants, surfactants, chelating agents, Compounding agent, coupling agent, adhesive, and adhesion control agent. Each of the aforementioned additives may be used alone or in combination of multiple types. For example, the first layer, the second layer and the third layer of the polymer film may each independently contain a dye or a pigment to form a colored polymer film, or contain an ultraviolet absorber or an infrared absorber to form a polymer film with an anti-ultraviolet function Or form a polymer film with anti-infrared function.

1.2. Properties of polymer films

1.2.1. void volume ( Vv ) related properties

The concave-convex structure of the surface of the polymer film can be displayed by measuring the three-dimensional image of the surface morphology. ISO 25178-2:2012 is a measurement specification for evaluating surface topography, which reveals a variety of parameters related to surface topography, including void volume (Vv), trough void volume (Vvv), core void volume ( Vvc), maximum trough depth (Sv). Vv is defined as the void volume per unit area under a specified load area rate, and can be calculated from a regional load area graph, where the Y-axis of the regional load area graph represents the surface height, and the X-axis represents the load area rate , When the load area rate of the X-axis is 0%, the surface height of the Y-axis is the maximum value, and when the load area rate of the X-axis is 100%, the surface height of the Y-axis is 0. For example, the Vv value when the load area ratio is 10% represents the gap covered below the horizontal cutting plane (horizontal cutting plane) set at the Y-axis surface height corresponding to the X-axis load area ratio of 10% size. Therefore, when the load area ratio is 0%, the Vv value is the maximum value, and when the load area ratio is 100%, the Vv value is 0. The Vvv value is defined as the volume of the trough space at a specified load area rate and can be calculated from the area load area graph. For example, the Vvv value when the load area rate is 80% represents the volume of the trough space covered above the regional load area curve when the load area rate on the X-axis is 80% to 100%. The Vvc value is defined as the volume of the core space at a specified load area rate and can be calculated from the area load area graph. For example, the Vvc value at the load area rate of 10% to 80% represents the volume of the core space covered above the regional load area curve when the load area rate of the X-axis is 10% to 80%. The sum of the Vvv value and the Vvc value is the Vv value. The Sv value is defined as the maximum value of the trough depth in a specified reference area, that is, the depth value of the deepest trough. For the relevant descriptions of Vv, Vvv, and Sv parameters, please refer to ISO 25178-2:2012, the full text of which is incorporated here for reference.

During the preparation of laminated glass, in order to allow the air to be discharged smoothly without remaining between the polymer film and the glass sheet, the surface of the polymer film needs to be textured (that is, a specific concave-convex structure) to facilitate exhaust. Research has found that when the Vv value on the surface of the polymer film is too small, air bubbles will remain in the laminated glass after the thermocompression process. On the other hand, if the Vv value of the surface of the polymer film is too large, the polymer film and the glass sheet cannot be completely adhered tightly, and the edges are prone to debonding defects, and the lines may not be able to collapse smoothly and cannot fully discharge the gas. cause air bubbles to remain. In view of this, in order to make the laminated glass without air bubbles and edge debonding defects, the first surface of the polymer film of the present invention has a Vv value of 3 cubic micrometers per square micrometer to 30 cubic micrometers when the loading area ratio is 10%. Micron/square micron, such as 3 cubic micron/square micron, 3.5 cubic micron/square micron, 4 cubic micron/square micron, 4.5 cubic micron/square micron, 5 cubic micron/square micron, 5.5 cubic micron/square micron, 6 cubic micron Micron/square micron, 6.5 cubic micron/square micron, 7 cubic micron/square micron, 7.5 cubic micron/square micron, 8 cubic micron/square micron, 8.5 cubic micron/square micron, 9 cubic micron/square micron, 9.5 cubic micron /square micron, 10 cubic micron/square micron, 10.5 cubic micron/square micron, 11 cubic micron/square micron, 11.5 cubic micron/square micron, 12 cubic micron/square micron, 12.5 cubic micron/square micron, 13 cubic micron/ Square micron, 13.5 cubic micron/square micron, 14 cubic micron/square micron, 14.5 cubic micron/square micron, 15 cubic micron/square micron, 15.5 cubic micron/square micron, 16 cubic micron/square micron, 16.5 cubic micron/square micron Micron, 17 cubic micron/square micron, 17.5 cubic micron/square micron, 18 cubic micron/square micron, 18.5 cubic micron/square micron, 19 cubic micron/square micron, 19.5 cubic micron/square micron, 20 cubic micron/square micron , 20.5 cubic micron/square micron, 21 cubic micron/square micron, 21.5 cubic micron/square micron, 22 cubic micron/square micron, 22.5 cubic micron/square micron, 23 cubic micron/square micron, 23.5 cubic micron/square micron, 24 cubic micron/square micron, 24.5 cubic micron/square micron, 25 cubic micron/square micron, 25.5 cubic micron/square micron, 26 cubic micron/square micron, 26.5 cubic micron/square micron, 27 cubic micron/square micron, 27.5 Cubic micron/square micron, 28 cubic micron/square micron, 28.5 cubic micron/square micron, 29 cubic micron/square micron, 29.5 cubic micron/square micron, or 30 cubic micron/square micron, or any two values between the above within the constituted range.

Research has also found that by controlling the ratio of the Vvv value and the Sv value to the thickness of the first layer, it is possible to avoid transferring the texture that should only be formed on the first surface to the middle layer of the polymer film (that is, the second layer) during mechanical embossing. On the surface of the third layer), there are filamentous stripes visible to the naked eye in the appearance of the laminated glass, which causes visual defects of optical deformation and affects the visibility of the laminated glass. Therefore, the Vvv value of the first surface of the polymer film of the present invention is less than 2 cubic micrometers/square micrometer when the loading area ratio is 80%, such as 1.95 cubic micrometers/square micrometer, 1.9 cubic micrometers/square micrometer, 1.85 cubic micrometers/square micrometer, or 1.85 cubic micrometers/square micrometer. Square micron, 1.8 cubic micron/square micron, 1.75 cubic micron/square micron, 1.7 cubic micron/square micron, 1.65 cubic micron/square micron, 1.6 cubic micron/square micron, 1.55 cubic micron/square micron, 1.5 cubic micron/square micron Micron, 1.45 cubic micron/square micron, 1.4 cubic micron/square micron, 1.35 cubic micron/square micron, 1.3 cubic micron/square micron, 1.25 cubic micron/square micron, 1.2 cubic micron/square micron, 1.15 cubic micron/square micron , 1.1 cubic micron/square micron, 1.05 cubic micron/square micron, 1.0 cubic micron/square micron, 0.95 cubic micron/square micron, 0.9 cubic micron/square micron, 0.85 cubic micron/square micron, 0.8 cubic micron/square micron, 0.75 cubic micron/square micron, 0.7 cubic micron/square micron, 0.65 cubic micron/square micron, 0.6 cubic micron/square micron, 0.55 cubic micron/square micron, 0.5 cubic micron/square micron, 0.45 cubic micron/square micron, 0.4 cubic micron/square micron, 0.35 cubic micron/square micron, 0.3 cubic micron/square micron, 0.25 cubic micron/square micron, 0.2 cubic micron/square micron, 0.15 cubic micron/square micron, 0.1 cubic micron/square micron, or 0.05 Cubic micron/square micron, or within the range formed by any two values above. The ratio of the Sv value of the first surface of the polymer film of the present invention to the thickness of the first layer is 0.2 or less, for example 0.2, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13, 0.12, 0.11, 0.1, 0.09, 0.08, 0.07, 0.06, 0.05, 0.04, 0.03, 0.02, or 0.01, or within the range formed by any two values above. In some embodiments of the present invention, the Vvv value of the first surface of the polymer film of the present invention is 0.2 cubic micrometers/square micrometer to 1.9 cubic micrometers/square micrometer when the loading area ratio is 80%, and the polymer film has a The ratio of the Sv value of the first surface to the thickness of the first layer is 0.05 to 0.18. In some embodiments of the present invention, the Vvv value of the first surface of the polymer film of the present invention is 0.5 cubic micron/square micron to 1.9 cubic micron/square micron when the loading area ratio is 80%, and the polymer film has a The ratio of the Sv value of the first surface to the thickness of the first layer is 0.07 to 0.18.

In the polymer film of the present invention, the Sv value of the first surface of the polymer film can be adjusted as required, as long as the ratio of the Sv value to the thickness of the first layer is within a specified range. In some embodiments of the present invention, the Sv value of the first surface of the polymer film is 70 microns or less. In some embodiments of the present invention, the Sv value of the first surface of the polymer film is 10 microns to 70 microns.

In a preferred embodiment of the present invention, the second surface of the polymer film also has the above-mentioned properties related to the void volume (Vv) of the first surface, including the second surface having a Vv value of 3 when the loading area ratio is 10%. Cubic micron/square micron to 30 cubic micron/square micron, the Vvv value of the second surface is less than 2 cubic micron/square micron when the loading area ratio is 80%, and the ratio of the Sv value of the second surface to the thickness of the second layer is 0.2 or less. For specific numerical examples of various ranges of properties of the second surface, reference may be made to relevant descriptions of the first surface, and details are not repeated here.

1.2.2. thickness

Under the conditions of meeting the specified Vv value, Vvv value, and the ratio of Sv value to the thickness of the first layer, the total thickness of the polymer film of the present invention and the respective thicknesses of the first layer, the second layer and the third layer can be selected according to actual needs. And adjust.

Generally speaking, the total thickness of the polymer film can be from 0.1 mm to 2.5 mm, such as 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2.0mm, 2.05mm, 2.1mm, 2.15mm, 2.2mm, 2.25mm , 2.3 mm, 2.35 mm, 2.4 mm, 2.45 mm, or 2.5 mm, or within the range formed by any two values above. In some embodiments of the present invention, the total thickness of the polymer film is 0.5 mm to 1.5 mm.

The thickness of the first layer and the second layer can be independently 250 microns to 450 microns, such as 250 microns, 255 microns, 260 microns, 265 microns, 270 microns, 275 microns, 280 microns, 285 microns, 290 microns, 295 microns, 300 microns, 305 microns, 310 microns, 315 microns, 320 microns, 325 microns, 330 microns, 335 microns, 340 microns, 345 microns, 350 microns, 355 microns, 360 microns, 365 microns, 370 microns, 375 microns, 380 microns , 385 microns, 390 microns, 395 microns, 400 microns, 405 microns, 410 microns, 415 microns, 420 microns, 425 microns, 430 microns, 435 microns, 440 microns, 445 microns, or 450 microns, or between any of the above Within the range formed by two values. The thickness of the first layer is preferably the same as the thickness of the second layer. In some embodiments of the present invention, the thicknesses of the first layer and the second layer are independently 300 microns to 420 microns.

The thickness of the third layer may be from 50 microns to 250 microns, such as 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns, 100 microns, 105 microns, 110 microns, 115 microns, 120 microns, 125 microns, 130 microns, 135 microns, 140 microns, 145 microns, 150 microns, 155 microns, 160 microns, 165 microns, 170 microns, 175 microns, 180 microns, 185 microns, 190 microns , 195 microns, 200 microns, 205 microns, 210 microns, 215 microns, 220 microns, 225 microns, 230 microns, 235 microns, 240 microns, 245 microns, or 250 microns, or between any two values above Inside. In some embodiments of the present invention, the third layer has a thickness of 100 microns to 200 microns.

1.2.3. glass transition temperature ( Tg )

Under the conditions of meeting the specified Vv value, Vvv value, and the ratio of Sv value to the thickness of the first layer, the glass transition temperature (Tg) of the first layer, the second layer and the third layer of the polymer film of the present invention can be determined according to the actual situation. need to be adjusted independently of each other. Generally speaking, the higher the Tg of the polymer film, the harder the polymer film is, and the less likely it is to form the desired texture when performing mechanical embossing. It is easy to press flowers too deeply when pressing flowers. Based on this, in some embodiments of the present invention, the Tg of the first layer and the second layer are independently controlled at 5°C to 25°C, such as 5°C, 6°C, 7°C, 8°C C, 9°C, 10°C, 10.5°C, 11°C, 11.5°C, 12°C, 12.5°C, 13°C, 13.5°C, 14°C, 14°C, 15°C, 15.5°C, 16°C, 16.5°C, 17°C, 17.5°C, 18°C, 18.5°C, 19°C, 19.5°C, 20°C, 20.5°C, 21°C, 21.5°C C, 22°C, 23°C, 24°C, or 25°C, or within the range formed by any two values above. The Tg of the third layer is controlled at -30°C to 10°C, such as -30°C, -29°C, -28°C, -27°C, -26°C, -25°C, -24 °C, -23°C, -22°C, -21°C, -20°C, -19°C, -18°C, -17°C, -16°C, -15°C, -14°C °C, -13°C, -12°C, -11°C, -10°C, -9°C, -8°C, -7°C, -6°C, -5°C, -4 °C, -3°C, -2°C, -1°C, 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C, or 10°C, or within the range formed by any two values above.

1.3. Preparation of polymer film

The preparation method of the polymer film of the present invention is not particularly limited. For example, polyvinyl acetal can be mixed and kneaded with selected components (such as plasticizers) to obtain a polymer film composition, and then the conventional film preparation method can be used to The polymer film composition is formed into a film and subjected to mechanical embossing, so as to provide the desired Vv value, Vvv value, and Sv value on the surface of the polymer film. Examples of the film preparation method include, but are not limited to, calendering, casting, extrusion tentering, direct extrusion, and extrusion blow molding.

In some embodiments of the present invention, the polymer film is prepared in the following manner, but the present invention is not limited thereto. First, using a twin-screw kneader to mix resinous polyvinyl acetal and plasticizer at a temperature of 150°C to 250°C and a speed of 100 rpm to 250 rpm for 5 minutes to 30 minutes to obtain A first polymeric film composition for making the first and second layers and a second polymeric film composition for making the third layer. Next, after the first polymer film composition and the second polymer film composition are cooled to room temperature, the first polymer film composition and the second polymer film composition are placed in a co-extruder (co-extruder ) Co-extruded into a film to provide the polymer film of the present invention.

The polymer film is then preheated and mechanically embossed to provide the desired Vv value, Vvv value, and Sv value. Mechanical embossing refers to the use of rollers to create textures on the surface of formed polymer films. The method of mechanical embossing includes but not limited to embossing wheel method and calendering wheel method, among which embossing wheel method is better. There is no special limitation on the pattern of mechanical embossing, for example, diamond, linear, zigzag, square, tapered, circular, approximately circular, and irregular. The above-mentioned lines and styles can be used alone, or multiple types can be used simultaneously.

Preheating and mechanical embossing conditions are adaptively adjusted according to the composition of the polymer film used. Generally speaking, the preheating wheel temperature may be 40°C to 90°C, specifically 45°C to 85°C. The pressing wheel temperature can be 80°C to 145°C, specifically 85°C to 135°C. The torque of the press wheel can be 0.32 N·m (Newton. Meter) to 1.42 N·m, specifically speaking, 0.32 N·m to 1.3 N·m. The pressing wheel pressure can be 5 kg/cm ² (kg/square centimeter) to 50 kg/cm ² , specifically 10 kg/cm ² to 40 kg/cm ² . In some embodiments of the present invention, the temperature of the preheating wheel is 60°C to 85°C, the temperature of the pressing wheel is 105°C to 135°C, the torque of the pressing wheel is 0.7 N·m to 1.2 N·m, The flower wheel pressure is 15 kg/cm ² to 38 kg/cm ² .

Aiming at the Vv-related properties of the polymer film, the study found that it can be adjusted through the temperature of the preheating wheel, the temperature of the pressing wheel, the torque of the pressing wheel, or the pressure of the pressing wheel. Generally speaking, the higher the temperature of the preheating wheel, the temperature of the embossing wheel, or the pressure of the embossing wheel, the greater the Vvc and Sv values. The greater the torque of the pressing wheel, the greater the value of Vvv.

2. Laminated glass

The polymer film of the present invention can be used to prepare laminated glass. Therefore, the present invention also provides a laminated glass comprising a first glass sheet, a second glass sheet, and an interlayer film between the first glass sheet and the second glass sheet, the interlayer film being composed of the above-mentioned polymerized provided by the film.

The first glass sheet and the second glass sheet may be the same or different, and may be any glass sheet conventionally used for making laminated glass, such as float glass, tempered glass, wired glass, or ordinary flat glass, but this The invention is not limited thereto. In the following examples, float glass is used as the first glass sheet and the second glass sheet.

The laminated glass of the present invention can be produced by a known method for preparing laminated glass in the related technical field. For example, the preparation of laminated glass can be carried out in the following way: a polymer film is sandwiched between two glass sheets to obtain a laminate, the laminate is placed in a vacuum bag and heated at a temperature of 20°C to 30°C Vacuum down (vacuum degree > 500 millimeters of mercury (mmHg)) for at least 10 minutes, then put the vacuum bag containing the laminate into the heating furnace, and slowly heat up from 60°C to 130°C for at least 30 minutes , take the vacuum bag out of the heating furnace, and complete the pre-pressing. Then, the pre-pressed laminate is placed in an autoclave, and hot-pressed under high temperature and high pressure conditions for 100 to 150 minutes to obtain laminated glass. The high temperature and high pressure conditions are a pressure of 10 bar to 15 bar and a temperature of 100°C to 150°C.

3. Example

3.1. Description of measurement method

The present invention is further exemplified with the following specific implementation forms, wherein, the measuring instruments and methods adopted are respectively as follows:

[Measurement of degree of acetalization of polyvinyl acetal]

The degree of acetalization of polyvinyl acetal is measured based on JIS K6728.

[Measurement of Acetyl Degree of Polyvinyl Acetal]

The acetylation degree of polyvinyl acetal is measured based on JIS K6728.

[Measurement of hydroxyl content of polyvinyl acetal]

The hydroxyl content of polyvinyl acetal is measured based on JIS K6728.

[Measurement of glass transition temperature (Tg)]

The Tg of the polymer film was measured using a differential scanning calorimeter (model: TA DSC 25, purchased from TA Instruments) under a nitrogen atmosphere. First, take 7 mg of polymer film as a sample and place it on the sample stage of a differential scanning calorimeter, raise the temperature to 150° C. at a heating rate of 10° C./min and keep at this temperature for 5 minutes. Then, the sample was equilibrated at -50°C and kept at this temperature for 5 minutes, and then, the temperature was raised to 100°C at a heating rate of 10°C/min to obtain a graph of temperature versus heat flow (X-axis is the temperature, and the Y-axis is the heat flow), and record the temperature corresponding to the midpoint of the glass transition as Tg.

[Measurement of void volume (Vv), void volume of trough (Vvv) and maximum trough depth (Sv)]

Cut the polymer film into 3 cm × 3 cm test samples, at a temperature of 24 ± 3 ° C and a relative humidity of 63 ± 3%, according to the specification of ISO 25178-2:2012, use laser scanning conjugate A laser scanning confocal microscope (model: LEXT OLS5000-SAF, purchased from Olympus) was used to measure the void volume (Vv) value of the polymer film at 10% loading area ratio, and at 80% loading Void volume (Vvv) value of the trough part and maximum trough depth (Sv) at the area ratio. The measurement conditions are as follows: the light source has a wavelength of 405 nm, the magnification of the objective lens is 100 times (MPLAPON-100xLEXT), the optical zoom is 50 times, the image area is 1500 microns × 1500 microns, and the resolution is 1024 pixels × 1024 pixels, operating conditions set to auto tilt removal (auto tilt removal), no filter used. From the obtained load area curve, the core void volume (Vvc) value at 10% and 80% load area ratio and the trough void volume (Vvv) value at 80% load area ratio can be obtained, Vv The value is the sum of the Vvv value and the Vvc value. The unit of Vvv value, Vvc value and Vv value is cubic micron/square micron. In addition, the Sv value can be directly interpreted by the instrument.

[Bubble residual test]

Cut the laminated glass into 30 cm x 30 cm test samples. Place the test sample vertically in an oven at 120°C for 2 hours. After taking it out of the oven, observe with the naked eye whether there are bubbles left in the test sample. Bubbles in contact with the outside air, the laminated glass is divided into the edge part (the area from the edge to 15 mm from the edge) and the central part (the area more than 15 mm from the edge) with a boundary of 15 mm from the edge. The evaluation criteria are as follows: If there are no air bubbles left in the edge and center of the test sample, record it as "◎", indicating that the air bubble test result is excellent; ○” means that the air bubble test result is good; and if there are air bubbles remaining in the edge and central part of the test sample, record it as “×”, which means the air bubble test result is not good.

[Edge degumming test]

Cut the laminated glass into 30 cm x 30 cm test samples. Place the test sample vertically in an oven at 50°C and a relative humidity of 95% for 14 days, and observe with the naked eye whether the edge of the test sample is degummed. The evaluation criteria are as follows: if there is no edge debonding of the test sample (that is, the glass and the polymer film are tightly bonded), the record is "◎", which means that the edge debonding test has passed; otherwise, if the test sample has edge debonding (that is, the glass and the polymer film The film is not tightly bonded), recorded as "×", which means it failed the edge debonding test.

[Evaluation of Optical Distortion]

First, prepare a 30 cm x 30 cm laminated glass as a test sample, and prepare a projector, a sample holder, and a white screen. Put the projector, sample holder and white screen in a dark room, wherein the sample holder is placed between the projector and the white screen, the distance between the projector and the sample holder and the distance between the sample holder and the white screen are 1.5 meter. Place the test sample on the sample holder, and adjust the angle so that the test sample is inclined towards the projector at 15 degrees relative to the axis vertical to the ground. Turn on the projector light source so that light passes through the test sample and is projected onto a white screen. Observe whether there is a significant difference in brightness and darkness on the white screen. If there is no, it means that there are no filamentary stripes (light ripples) in the laminated glass, and the record is "none"; if there is, it means that there are filamentary stripes (light ripples) in the laminated glass. Ripple), the record is "Yes".

3.2. Preparation and property measurement of polymer film

First, 100 parts by weight of poly(vinyl butyral) (PVB, purchased from Changchun Petrochemical Co., Ltd.) and 40 parts by weight of plasticizer (triethylene glycol bis(2-ethylhexanoate) ) were mixed to obtain a mixture, and after kneading the mixture at 200° C. at a rotational speed of 150 rpm for 15 minutes using a twin-screw kneader, it was cooled to room temperature to obtain the first polymer film for the first layer and the second layer combination. Next, 100 parts by weight of poly(vinyl butyral) (PVB, purchased from Changchun Petrochemical Co., Ltd.) and 60 parts by weight of plasticizer (triethylene glycol bis(2-ethylhexanoate) ) were mixed to obtain a mixture, which was kneaded by a twin-screw kneader at a rotation speed of 150 rpm for 15 minutes at 200° C., and then cooled to room temperature to obtain a second polymer film composition for the third layer. The first polymer film composition and the second polymer film composition are placed in a co-extrusion extruder and extruded into a polymer film having a three-layer structure of the first layer/third layer/second layer.

According to the parameter conditions shown in Table 1-1 and Table 1-2, the two surfaces of the polymer film were preheated and mechanically embossed to obtain the polymer films of Examples 1 to 6 and Comparative Examples 1 to 7. In addition to the parameter conditions shown in Table 1-1 and Table 1-2, the linear speed of the polymer film passing between the embossing wheels is 12 m/min. Measure the acetalization degree, acetylation degree and hydroxyl content ratio of the PVB used in Examples 1 to 6 and Comparative Examples 1 to 7 according to the method described above, and record the results in Table 2-1 to Table 2-2 . In addition, the thickness, Tg, Vv, Vvv, Vvc, and Sv of each layer of the polymer film of Examples 1 to 6 and Comparative Examples 1 to 7 were measured according to the above measurement method, and the results were recorded in Table 2-3 to Table 2 -4 in.

Table 1-1: Mechanical embossing parameter conditions of the polymer films of Examples 1 to 6 parameter Preheating wheel temperature Pressing wheel temperature Press wheel torque Press wheel pressure unit °C °C N·m kg/ ^cm2 Example 1 63 110 0.73 18 2 68 120 1.03 28 3 75 120 0.76 twenty three 4 72 120 0.85 26 5 75 130 1.15 35 6 83 130 0.96 33

Table 1-2: Mechanical embossing parameter conditions of the polymer films of Comparative Examples 1 to 6 parameter Preheating wheel temperature Pressing wheel temperature Press wheel torque Press wheel pressure unit °C °C N·m kg/ ^cm2 comparative example 1 85 140 1.42 45 2 78 140 1.08 50 3 78 120 1.34 34 4 40 80 0.32 5 5 90 145 0.85 30 6 75 130 0.86 34 7 65 120 0.75 38

Table 2-1: Properties of PVB of Examples 1 to 6 nature unit Example 1 2 3 4 5 6 First and second floors Degree of acetalization Mole% 71.36 71.47 71.75 71.98 71.67 71.18 Acetyl Mole % 0.44 0.43 0.45 0.42 0.43 0.52 Hydroxyl content ratio Mole% 28.2 28.1 27.8 27.6 27.9 28.3 the third floor Degree of acetalization Mole% 67.0 71.1 70.6 67.2 62.1 57.9 Acetyl Mole% 8.2 5.6 2.2 7.2 12.5 15.8 Hydroxyl content ratio Mole% 24.8 23.3 27.2 25.6 25.4 26.3

Table 2-2: Properties of PVB of Comparative Examples 1 to 6 nature unit comparative example 1 2 3 4 5 6 7 First and second floors Degree of acetalization Mole% 71.05 71.68 72.15 70.70 70.98 71.21 69.20 Acetyl Mole% 0.45 0.52 0.55 0.40 0.42 0.49 5.20 Hydroxyl content ratio Mole% 28.5 27.8 27.3 28.9 28.6 28.3 25.6 the third floor Degree of acetalization Mole% 73.2 67.7 64.4 59.5 70.0 72.8 55.1 Acetyl Mole % 4.3 6.2 8.3 15.1 5.2 3.5 18.3 Hydroxyl content ratio Mole% 22.5 26.1 27.3 25.4 24.8 23.7 26.6

Table 2-3: Properties of the polymer films of Examples 1 to 6 nature unit Example 1 2 3 4 5 6 Tg of the first layer and the second layer °C 13.2 13.7 13.8 14.3 14.2 14.3 Tg of the third layer °C -15.2 -13.3 5.3 -12.6 -20.3 -22.7 The individual thickness of the first layer and the second layer Micron 360 361 387 366 348 402 The thickness of the third layer Micron 135 125 120 142 138 162 Vvv μm ³ /μm ² 0.60 1.25 0.63 0.81 1.83 1.11 Vvc μm ³ /μm ² 8.96 14.80 18.70 17.64 22.52 26.32 Vv μm ³ /μm ² 9.56 16.05 19.33 18.45 24.35 27.43 Sv Micron 27.31 49.70 36.63 45.60 59.82 51.65 Sv/thickness of the first layer 0.08 0.14 0.09 0.12 0.17 0.13

Tables 2-4: Properties of the polymer films of Comparative Examples 1 to 7 nature unit comparative example 1 2 3 4 5 6 7 Tg of the first layer and the second layer °C 14.6 13.3 13.1 15.3 14.5 14.4 -9.3 Tg of the third layer °C -14.6 -11.7 -13.5 -25.6 -15.3 -10.3 -28.7 The individual thickness of the first layer and the second layer Micron 349 358 356 362 325 285 375 The thickness of the third layer Micron 136 135 131 135 139 132 125 Vvv μm ³ /μm ² 2.81 1.52 2.32 0.18 0.79 0.83 4.62 Vvc μm ³ /μm ² 33.64 32.25 19.24 2.15 52.66 23.32 70.51 Vv μm ³ /μm ² 36.45 33.77 21.56 2.33 53.45 24.15 75.13 Sv Micron 88.43 94.71 55.25 8.25 59.25 60.12 105.30 Sv/thickness of the first layer 0.25 0.26 0.16 0.02 0.18 0.21 0.28

3.3. Preparation and property evaluation of laminated glass

Laminated glass was prepared using the polymer films of Examples 1 to 6 and Comparative Examples 1 to 7, respectively. First, prepare two clean transparent float glass sheets (the length is 300 mm, the width is 300 mm, and the thickness is 2 to 2.2 mm), then, the polymer films of Examples 1 to 6 and Comparative Examples 1 to 7 are A laminate is sandwiched between two transparent float glass sheets respectively, and the laminate is vacuumized by vacuum bag method for pre-pressing. The vacuum bag operation method is as follows: put the laminate into the vacuum bag and evacuate (vacuum degree > 500 millimeters of mercury (mmHg)) at a temperature of 20°C to 30°C for at least 10 minutes, then Put the vacuum bag with the laminate into the heating furnace, first maintain the temperature at 20°C to 30°C for 10 to 20 minutes, then raise the temperature to 60°C to 130°C and maintain it for 15 to 45 minutes, then Remove the vacuum bags from the oven and allow to cool at room temperature. After cooling, release the vacuum and remove the laminate. The pre-pressed laminate was placed in an autoclave for 120 minutes at a pressure of 13 bar and a temperature of 135°C, and then cooled to room temperature to obtain a laminated glass.

According to the method mentioned above, optical deformation evaluation, air bubble residual test, and edge debonding test were performed on the laminated glasses of Examples 1 to 6 and Comparative Examples 1 to 7, and the results are recorded in Table 3.

Table 3: Properties of the laminated glass of Examples 1 to 6 and Comparative Examples 1 to 7 optical distortion air bubbles Edge degumming Example 1 none ◎ ◎ 2 none ◎ ◎ 3 none ◎ ◎ 4 none ◎ ◎ 5 none ◎ ◎ 6 none ○ ◎ comparative example 1 have ○ x 2 have ○ x 3 have ◎ ◎ 4 none x ◎ 5 none x x 6 have ◎ ◎ 7 have x x

As shown in Table 3, the laminated glass made from the polymer film of the present invention has obtained satisfactory results in the optical deformation evaluation, air bubble residual test and edge debonding test. In particular, Examples 1 to 6 show that only when the Vv value of the first surface of the polymer film, the Vvv value and the ratio of the Sv value to the thickness of the first layer are all within the specified range, the laminated glass can be free of bubbles at the same time Residue, no optical distortion, and no edge debonding.

In contrast, as shown in Table 3, the laminated glass made of the polymer film not belonging to the present invention cannot obtain satisfactory results in the optical deformation evaluation, air bubble residual test and edge debonding test. Specifically, comparison of Examples 1 and 7 shows that if the Vv value of the first surface of the polymer film, the Vvv value and the ratio of the Sv value to the thickness of the first layer are not within the specified range, the laminated glass produced has optical distortion, Bubbles remain and there is edge debonding. Comparative Example 2 shows that if the ratio of the Sv value of the first surface of the polymer film to the thickness of the first layer and the Vv value are not within the specified range, even if the Vvv value is within the specified range, the laminated glass produced has optical distortion and has Debonding of the edges. Comparative Example 3 shows that if the Vvv value of the first surface of the polymer film is not within the specified range, even if the ratio of the Vv value to the Sv value to the thickness of the first layer is within the specified range, the laminated glass produced will have optical distortion. Comparing Examples 4 and 5 shows that if the Vv value of the first surface of the polymer film is not within the specified range, even if the ratio of the Vvv value to the Sv value to the thickness of the first layer is within the specified range, the laminated glass produced will have bubbles Residue and possible edge debonding. Comparative Example 6 shows that if the ratio of the Sv value of the first surface of the polymer film to the thickness of the first layer is not within the specified range, even if the Vv and Vvv values are both within the specified range, the laminated glass produced will have optical distortion.

The above-mentioned embodiments are only illustrative to illustrate the principles and effects of the present invention, and illustrate the technical features of the present invention, rather than limiting the scope of protection of the present invention. Any change or arrangement that can be easily accomplished by those skilled in the art falls within the scope of the present invention. Therefore, the scope of protection of the rights of the present invention is listed in the appended patent scope.

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Claims (10)

A polymer film comprising a first layer, a second layer and a third layer, the third layer is located between the first layer and the second layer, and the two surfaces of the third layer are respectively in contact with the first layer and the second layer In contact, the surface of the first layer that is not in contact with the third layer is the first surface, and the surface of the second layer that is not in contact with the third layer is the second surface, where the first surface is when the load area ratio (material ratio) is 10%. The void volume (void volume, Vv) value of 3 cubic micrometers / square micrometers (μm ³ /μm ² ) to 30 cubic micrometers / square micrometers, the void volume of the trough part of the first surface when the load area ratio is 80% (dale The value of void volume (Vvv) is less than 2 cubic micrometers per square micrometer, and the ratio of the maximum pit height (Sv) value of the first surface to the thickness of the first layer is 0.2 or less. The polymer film as claimed in claim 1, wherein the second surface has a void volume value of 3 cubic micrometers/square micrometer to 30 cubic micrometers/square micrometer when the loading area ratio is 10%, and the second surface has a void volume value when the loading area ratio is 10%. The 80% trough void volume value is less than 2 cubic micrometers per square micrometer, and the ratio of the maximum trough depth value of the second surface to the thickness of the second layer is 0.2 or less. The polymer film according to claim 1, wherein the thicknesses of the first layer and the second layer are each independently 250 microns to 450 microns. The polymer film as claimed in claim 1, wherein the thickness of the first layer is the same as that of the second layer. The polymer film according to claim 1, wherein the third layer has a thickness of 50 microns to 250 microns. The polymer film according to any one of claims 1 to 5, wherein the polymer film comprises polyvinylacetal. The polymer film according to claim 6, wherein the polyvinyl acetal is poly(vinyl butyral) (poly(vinyl butyral)). The polymer film of claim 6, wherein the third layer comprises polyvinyl acetal and has a glass transition temperature (glass transition temperature, Tg) of -30°C to 10°C, wherein the polyvinyl acetal The aldehyde has a degree of acetalization of 52-80 mol%, an acetylation degree of 0.1-20 mol%, and a hydroxyl content of 20-28 mol%. The polymer film according to any one of claims 1 to 5, which has a total thickness of 0.1 mm to 2.5 mm. A laminated glass comprising a first glass sheet, a second glass sheet, and an intermediate film between the first glass sheet and the second glass sheet, the intermediate film is made of any one of claims 1 to 9 Provided by the polymer film described in the item.